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General Information
Determining Scheduled
Maintenance Intervals
Performing regular maintenance on your Freightliner
will help ensure that your Freightliner delivers safe
reliable service and optimum performance for years
to come. Failure to follow a regular maintenance pro-
gram can result in inefficient operation and unsched-
uled down time.
To determine the correct maintenance intervals for
your vehicle you must first determine the type of ser-
vice or conditions the vehicle will be operating in.
Generally, most vehicles operate under conditions
that fall within one of the four types of service de-
scribed. Before placing your new vehicle in service,
determine the type of service (Service Schedule I, II,
III, or IV) that applies to the intended use of the ve-
hicle. After determining the vehicle's type of service,
refer to the service schedule table or the vehicle
maintenance schedule table, to determine how often
maintenance should be performed.
When the vehicle reaches the distance given for a
maintenance interval, see the Maintenance Interval
Operation Table for a list of the maintenance opera-
tions to be performed at that maintenance interval.
Use the maintenance operation reference numbers to
find detailed instructions in the manual on each op-
eration.
Types of Service
Service Schedule I (severe service) applies to ve-
hicles that annually travel less than 6000 miles (10
000 kilometers) or that operate under severe condi-
tions. Examples of severe service, Schedule I usage
include: operation on extremely poor roads or where
there is heavy dust accumulation; constant exposure
to extreme hot, cold, salt-air, or other extreme cli-
mates; frequent short-distance travel; construction-
site operation; city operation (fire truck); or farm
operation.
Service Schedule II (short-haul transport) applies to
vehicles that annually travel less than 60,000 miles
(100 000 kilometers) and operate under normal con-
ditions. Examples of Schedule II usage are: opera-
tion primarily in cities and densely populated areas;
local transport with infrequent freeway travel; or high
percentage of stop-and-go travel.
Service Schedule III (long-haul transport) is for ve-
hicles that annually travel more than 60,000 miles
Century Class Trucks Maintenance Manual, August 2017
Determining Scheduled Maintenance Intervals: 00–01
(100 000 kilometers) with minimal city or stop-and-go
operation. Examples of Schedule III usage are: re-
gional delivery that is mostly freeway miles; interstate
transport; or any road operation with high annual
mileage.
Service Schedule IV (long haul transport for Opti-
mized Vehicle Configuration) is for vehicles that an-
nually travel over 60,000 miles (100 000 km) and
meet the following qualifications:
• Meritor 15-1/2 inch dampened/ceramic Lite
Pedal LTD clutch with sealed release bearing.
• Synthetic transmission fluid used in transmis-
sion.
• Meritor FF–961 or FF–981 front axle (12,000 lb.
capacity) with synthetic lubricant.
• Front suspension with maintenance-free rubber
bushings for 12,000 lb. capacity suspension.
• Meritor RPL series, or Spicer SPL series drive-
line U-joints.
• Synthetic lubricant used in rear axle.
• Equipped with any Freightliner AirLiner suspen-
sion.
• Equipped with Meritor Q-Plus extended-lube
cam brakes and automatic slack adjusters, front
and rear.
• Standard brake system package including Ben-
dix AD-9 air dryer—mounted on the right-hand
frame rail, located directly behind the front
bumper—with heater, and a Bendix air com-
pressor.
• TRW TAS–65 power steering.
NOTE: Maintenance instructions in this manual
are based on average vehicle use and normal
operating conditions. Unusual vehicle operating
conditions may require service at more frequent
intervals.
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